Packing for steam and hydraulic use.



M. MONTGOMERY & H. M. STEWART.

PACKING FOR STEAM AND HYDRAULIC USE.

APPLICATION FILED JUNI; 1s, 1914.

3,1 17,688. Patented N0v.17,1914.

MARSHALL MONTGOMERY AND HENRY M. STEWART, F PHILADELPHIA, PENNSYL- VANIA, ASSIGNOR-S TO MONTGOMERY BROTHERS, INCORPORATED, A CORPORATION OF PENNSYLVANIA.

minces'.

Specification of Letters Patent.

Patented Nov. 17, 1914.

Application led June 13, 1914. Serial No. 844,865.

To @ZZ whom/ it may concern:

Be it known that we, MARSHALL MONT- GOMERY andHnNnr M. STEWART, citizens of the United States, and residents of Philadelphia, county of Philadelphia, and State of Pennsylvania, have invented an improvement in Packing for Steam and Hydraulic Use, of which the following is a specification.

r.lhe object of our invention is to provide an effective construction of steam and water packing suitable for packing piston rods, plungers, etc., the packing being easily ap plied in use and adjustable under' normal compression to. adapt itself to the shape of the chamber which it is to occupy.

Our object is further, to so combine the wearing sections of the packing with an intermediate connectinga yielding portion that the several parts may be normally held in relative position without the necessit of braided or other coverings as hereto ore in common use.

Our invention consists of a packing of general rectangular or square cross section and comprising two wearing strips oi vulcanized fibrous material, each of substantial triangular cross section, said sections united on their diagonal opposing surfaces by an elastic section extending diagonally across the packing, all of said sections being vulcanized into union to form one unitary bodyf Our invention also comprehends other features of construction which, together with the improvements above specified, will be better understood by reference to 'the drawings, in which Figure lis a cross sectional view ci a packing embodying our invention; Fig. 2 is a cross section showing the juxtaposed relation of two portions, rings or coils of our improved packing in use; and Figs. 3 to 6 ar cross sectional views of modifications of our invention.

Referring to Figs. l and 2, the packing is substantially square or rectangular in cross section and comprises the triangular wearing portions or sections 2 and 3 having oblique or diagonal opposing surfaces, which are united by the interposed diagonal section e of rubber. The sections 2 and 3 are each formed of superposed layers of rubberized fabric pressed together and vulcanized into an integral strip. These strips or sections 2 and 3 are connected by the oblique rubber sheet or layer 4: arranged between the sections 2 and 3, which is vulcanized into permanent adherence to said sections. This yielding rubber connection i is made on a diagonal to the sides of the packing as a whole, and is of suiicient thickness to give capacity to the two sections 2 and 3 to be relatively movable under compression. This packing when compressed in a vertical'direction, Fig. 1, will spread laterally to widen itself commensurately with its compression. The packing may be cut into rings or employed in spiral form and placed in the packing receiving chamber, and when subjected to compression, by tightening the usual gland upon it, the section 2 will be forced downward and laterally, the latter movement being the resultant of the oblique opposing faces of the sections 2 and 3 when relatively shifted one over the other. ln this way, the packing widens within the annular packing chamber and puts pressure upon the piston rod or plunger to make a tight joint. ln Fig. 2, we have shown two juxtaposed sections of the packing, of which there may be any number desired, according to requirements. It will be noted in this ligure, that where the rubber terminates above the liber at 5, the fiber or textile surface 5 of the next section presses directly upon the rubber, and on the compression, approaches the section 2 so as to reduce the thickness of the interposed rubber exposed at 5, as is desirable. ln this way, the packing in use will present a large amount of textile fiber and very little rubber to the piston rod or plunger.

In the construction shown in F ig. 3, we have the outer top and bottom layers of the sections 2 and 3 extended over the diagonal rubber section 4, so that each packing ring will have within itself the iber body 6 over the rubber at 5 to compress it and minimize the rubber surface exposed to the piston rod.

ln Fig. Ll, we have shown a modiication where greater elasticity is required and in this case the rubberized fibrous or cloth layers 6 of Fig. 3 are substituted by rubber layers 7 at top and. bottom; but being thinner than the vertical thickness et the lll@ diagonal rubber section 4, these layers do not interfere with the function of the rubber section 4 in its attached relation to the Wearing and packing sections 2 and 3. rIhis use of the rubber layers 7 would be better suited to machines of low temperature, .but may be employed for all general uses, if so desired. l

In the construction shown in Fig. 5., we have formed the sections 2 and ,3B in a somewhat different manner, but the packing as a whole is substantially of the same gene eral construction shown in the other Afigures. In this case, the portions of triangular cross section, 2a and 3a, are formed of' a rubberized asbestos sheet rolled up and com pressed into triangular cross section and vulcanized, and these'in turn vulcanized to the interposed diagonal section 4 of rubber. We have also shown in this Fig. 5, by way of example, the use of an envelo of brai'ded cotton 8; but as all of the sections in these packings are vulcanized into one unitary structure, such envelop will not ordinarily be required. Such an envelopmay be used in any of the formsvof our invention, or omitted, asv preferred. If used, the envelop,

braided orotherwise suitably formed, may

be impregnated with pliimlyiago, tallow or other lubricant, separately or in association with other substances. l

In Fig. 6, we have shown the construction substantially shown in Fig. 1, but in this case the rubberized fabric sections 2 and 3. may be true triangles and the rubbersection 4 extend equally on its ends both upon the top and sides of the complete unitar l structure.

We have shown the preferred forms of our packing and which 'we have found satisfactory in practice, byway of illustration of the nature of our invention, but we do' not restrict ourselves thereto, as the details may be modified in various 'ways Without de arting from the spirit of the invention.-

aving now described our invention, what we claim as new and desire to secure by Letters Patent, is Y l. Packing for steam and hydraulic use,

a connecting diagonal strip of rubber interposed between -.the first mentioned strips of .triangular cross section, the three .strips all vulcanized into a unitary structure the interposed rubber strips providing a' yielding connection between the two triangular strips and permitting them to shift under com pression to widen the width of the packing while maintaining the unitary character of the structure.

2. Packing for steam and hydraulic use, comprising two parallel strips of rubberized fibrous material each substantially triangular in cross section and presenting opposed diagonal surfaces, a connecting diagonal strip of rubber interposed between the first mentioned strips vof triangular cross section, and outer thin layers of rubber upon the oppositeends of the two triangular lstrips said rubber layers uniting respectively with the ends of the diagonal rubber layer, the three strips all vulcanized into a unitary structure.

3. Packing for steam and hydraulic use, comprising two pamllel strips of triangular cross section formed of dense but slightly yielding material and presenting diagonal opposed surfaces, and an interposed elastic layer vulcanized to each of said diagonal surfaces for uniting the parallel strips' into a unitary structure and so as to pro-- vide a verywyielding union whereby the layers maybe shifted relatively to. each other under compression to widen the packing,

while maintaining their permanent union with the lelastic layer. v

. Intestimony of which invention, we here# unto-set our hands.

MARSHALL MONTGOMERY. HENRY M. STEWART.

A Witnesses: HORACE. D. REEVE,

R. 'M HUNTER. 

